/* ---------- Tokens ---------- */
:root {
  color-scheme: light;

  /* 色板 */
  --ink-900: #ffffff;
  --ink-800: #f5f8fc;
  --ink-700: #e9eff7;
  --ink-600: #dee5f0;
  --line: rgba(23, 43, 77, 0.13);
  --line-strong: rgba(23, 43, 77, 0.26);
  --fg: #0f1a2b;
  --fg-dim: #46536b;
  --fg-mute: #6e7c94;
  --cyan: #0a7c9c;
  --cyan-deep: #085f79;
  --amber: #a35c00;
  --violet: #5b4bd6;
  --danger: #c62a44;
  --ok: #12864c;

  /* 渐变 / 纹理 */
  --grad-brand: linear-gradient(135deg, #0e7490 0%, #4338ca 100%);
  --dot-grid: radial-gradient(rgba(23, 43, 77, 0.06) 1px, transparent 1px);

  /* 排版 */
  --font-display: "Space Grotesk", "Avenir Next", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", "PingFang SC", "Microsoft YaHei",
    sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", Consolas, "Courier New",
    monospace;

  --step--1: 0.78rem;
  --step-0: 0.95rem;
  --step-1: 1.12rem;
  --step-2: 1.4rem;
  --step-3: 1.8rem;
  --step-4: 2.3rem;

  /* 间距 / 圆角 / 阴影 */
  --gap: 1rem;
  --pad-block: 3.5rem;
  --radius: 2px;
  --shadow-1: 0 1px 0 rgba(255, 255, 255, 0.9) inset,
    0 16px 36px -26px rgba(15, 23, 42, 0.22);
  --shadow-glow: 0 0 0 1px rgba(10, 124, 156, 0.32),
    0 12px 28px -12px rgba(10, 124, 156, 0.4);

  /* 动效 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur: 280ms;
  --dur-slow: 620ms;

  --container: 1180px;
  --header-h: 68px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1.5rem);
}
figure{margin-left: 0; margin-right: 0}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image: var(--dot-grid);
  background-size: 26px 26px;
  background-position: -13px -13px;
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 0.55em;
}

h1 {
  font-size: var(--step-4);
}
h2 {
  font-size: var(--step-3);
}
h3 {
  font-size: var(--step-2);
}
h4 {
  font-size: var(--step-1);
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--cyan);
  text-decoration-color: rgba(10, 124, 156, 0.35);
  text-underline-offset: 3px;
}

img,
svg {
  display: block;
  max-width: 100%;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

/* Chrome 51 不支持 :focus-visible，用 :focus 兜底键盘可访问性 */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus,
.btn:focus,
[tabindex]:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

::selection {
  background: rgba(10, 124, 156, 0.16);
  color: var(--fg);
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

/* ---------- 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.1rem;
  padding-left: clamp(1.1rem, 0.5rem + 3vw, 2.5rem);
  padding-right: 1.1rem;
  padding-right: clamp(1.1rem, 0.5rem + 3vw, 2.5rem);
}

.section {
  padding-top: var(--pad-block);
  padding-bottom: var(--pad-block);
  position: relative;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.stack > * + * {
  margin-top: var(--gap);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.dim {
  color: var(--fg-dim);
}
.mute {
  color: var(--fg-mute);
}
.mono {
  font-family: var(--font-mono);
}
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--cyan);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-decoration: none;
  transition: top var(--dur) var(--ease-out);
}
.skip-link:focus {
  top: 0.75rem;
}

/* 章节眉标 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.section-head {
  max-width: 62ch;
  margin-bottom: 2rem;
  margin-bottom: clamp(2rem, 1rem + 3vw, 3.5rem);
}
.section-head p {
  color: var(--fg-dim);
  font-size: var(--step-1);
  margin-bottom: 0;
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--fg);
  --btn-bd: var(--line-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.82rem 1.4rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  /* text-transform: uppercase; */
  text-decoration: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out),
    color var(--dur) var(--ease-out), background-color var(--dur) var(--ease-out);
}
.btn:hover {
  transform: translateY(-2px);
}
.btn:active {
  transform: translateY(0);
}

.btn--primary {
  --btn-bg: var(--cyan);
  --btn-fg: #ffffff;
  --btn-bd: var(--cyan);
  font-weight: 600;
}
.btn--primary:hover {
  box-shadow: var(--shadow-glow);
}

.btn--ghost:hover {
  --btn-bd: var(--cyan);
  color: var(--cyan);
}

.btn--sm {
  padding: 0.5rem 0.85rem;
}

.btn svg {
  width: 15px;
  height: 15px;
  flex: none;
}

/* 文字链接下划线动效 */
.link-line {
  position: relative;
  color: var(--fg);
  text-decoration: none;
  padding-bottom: 2px;
}
.link-line::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: bottom right;
  transition: transform var(--dur) var(--ease-out);
}
.link-line:hover {
  color: var(--cyan);
}
.link-line:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

/* ---------- 卡片 ---------- */
.panel {
  background: linear-gradient(180deg, #ffffff, #fbfcfe);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  position: relative;
}
.panel--pad {
  padding: 1.25rem;
  padding: clamp(1.25rem, 0.9rem + 1.4vw, 2rem);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.22rem 0.5rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--fg-dim);
}
.tag--cyan {
  color: var(--cyan);
  border-color: rgba(10, 124, 156, 0.4);
  background: rgba(10, 124, 156, 0.07);
}
.tag--amber {
  color: var(--amber);
  border-color: rgba(163, 92, 0, 0.4);
  background: rgba(163, 92, 0, 0.07);
}

/* ============================================================
   Header / 导航
   ============================================================ */
.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease-out),
    background-color var(--dur) var(--ease-out);
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.97);
}

.nav-bar {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--fg);
  flex: none;
}
.brand__mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--grad-brand);
  color: #ffffff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius);
}
.brand__text {
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand__text small {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.site-nav {
  margin-left: auto;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.site-nav__link {
  display: inline-block;
  padding: 0.5rem 0.8rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--fg-dim);
  text-decoration: none;
  border-radius: var(--radius);
  position: relative;
  transition: color var(--dur-fast) var(--ease-out);
}
.site-nav__link:hover {
  color: var(--fg);
}
.site-nav__link.is-active {
  color: var(--cyan);
}
.site-nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 0.8rem;
  right: 0.8rem;
  bottom: 0.15rem;
  height: 1px;
  background: var(--cyan);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: none;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0;
  place-items: center;
}
.nav-toggle span {
  display: block;
  width: 17px;
  height: 1.5px;
  background: var(--fg);
  margin: 3px auto;
  transition: transform var(--dur) var(--ease-out),
    opacity var(--dur-fast) linear;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(4.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-4.5px) rotate(-45deg);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  overflow: hidden;
  padding-top: 4rem;
  padding-top: clamp(4rem, 2rem + 10vw, 8.5rem);
  padding-bottom: var(--pad-block);
}
.hero::before {
  content: "";
  position: absolute;
  inset: -40% 20% auto -10%;
  background: radial-gradient(
    50% 50% at 30% 30%,
    rgba(10, 124, 156, 0.1),
    transparent 70%
  );
  filter: blur(20px);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  right: -15%;
  top: -25%;
  width: 55vw;
  height: 55vw;
  background: radial-gradient(
    50% 50% at 50% 50%,
    rgba(91, 75, 214, 0.08),
    transparent 70%
  );
  filter: blur(30px);
  pointer-events: none;
}
.hero > .shell {
  position: relative;
  z-index: 1;
}

.hero__grid {
  display: grid;
  gap: 2rem;
  gap: clamp(2rem, 1rem + 4vw, 4rem);
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  align-items: center;
}

.hero h1 {
  margin-bottom: 0.4em;
}
.hero h1 em {
  font-style: normal;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__lede {
  font-size: var(--step-1);
  color: var(--fg-dim);
  max-width: 46ch;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--fg-mute);
}
.hero__meta div {
  flex: none;
}
.hero__meta b {
  color: var(--fg);
  font-weight: 500;
}

/* Hero 右侧：候选词模拟窗 */
.suggest-demo {
  padding: 0;
  overflow: hidden;
}
.suggest-demo__bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: rgba(242, 246, 251, 0.95);
}
.suggest-demo__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-strong);
}
.suggest-demo__url {
  margin-left: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--fg-mute);
  letter-spacing: 0.05em;
}
.suggest-demo__body {
  padding: 1.1rem;
}
.suggest-demo__field {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--ink-800);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}
.suggest-demo__field svg {
  width: 15px;
  height: 15px;
  color: var(--cyan);
  flex: none;
}
.caret {
  display: inline-block;
  width: 1px;
  height: 1.05em;
  background: var(--cyan);
  vertical-align: -2px;
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink {
  to {
    visibility: hidden;
  }
}
.suggest-demo__list {
  margin-top: 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.suggest-demo__item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.6rem 0.85rem;
  font-size: 0.88rem;
  color: var(--fg-dim);
  border-bottom: 1px solid var(--line);
  background: #fbfcfe;
}
.suggest-demo__item > span:last-child {
  min-width: 0;
  overflow-wrap: anywhere;
}
.suggest-demo__item:last-child {
  border-bottom: 0;
}
.suggest-demo__item.is-hot {
  background: rgba(10, 124, 156, 0.08);
  color: var(--fg);
}
.suggest-demo__item svg {
  width: 13px;
  height: 13px;
  color: var(--fg-mute);
  flex: none;
}
.suggest-demo__item mark {
  background: none;
  color: var(--cyan);
  font-weight: 600;
}
.suggest-demo__foot {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0.9rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-mute);
}
.scanline {
  position: relative;
  user-select: none;
}
.scanline::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 34%;
  background: linear-gradient(
    180deg,
    rgba(10, 124, 156, 0.1),
    transparent
  );
  animation: scan 4.5s var(--ease-out) infinite;
  pointer-events: none;
}
@keyframes scan {
  0% {
    transform: translateY(-100%);
  }
  55%,
  100% {
    transform: translateY(320%);
  }
}

/* ---------- 公告条 ---------- */
.notice {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem 1.25rem;
  align-items: center;
  padding: 1.15rem 1.1rem;
  padding: 1.15rem clamp(1.1rem, 0.8rem + 1.2vw, 1.75rem);
  border: 1px solid rgba(163, 92, 0, 0.28);
  border-left: 2px solid var(--amber);
  background: linear-gradient(
    90deg,
    rgba(163, 92, 0, 0.09),
    rgba(163, 92, 0, 0.02) 60%
  );
  border-radius: var(--radius);
}
.notice__icon {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(163, 92, 0, 0.4);
  border-radius: var(--radius);
  color: var(--amber);
}
.notice__icon svg {
  width: 17px;
  height: 17px;
}
.notice p {
  margin: 0;
  color: var(--fg-dim);
  font-size: var(--step--1);
  line-height: 1.7;
}
.notice strong {
  color: var(--fg);
}
.notice a {
  color: var(--amber);
  font-family: var(--font-mono);
  word-break: break-all;
}

/* ---------- 产品介绍 ---------- */
.split {
  display: grid;
  gap: 2rem;
  gap: clamp(2rem, 1rem + 4vw, 4.5rem);
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: start;
}
.prose p {
  color: var(--fg-dim);
}
.prose p:first-of-type {
  font-size: var(--step-1);
  color: var(--fg);
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.12em 0.4em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(240, 244, 250, 0.95);
  color: var(--cyan);
}

.spec-list li {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: var(--step--1);
}
.spec-list li:first-child {
  border-top: 1px dashed var(--line);
}
.spec-list dt,
.spec-list .spec-list__k {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-mute);
  font-size: 0.7rem;
  padding-top: 0.2rem;
}
.spec-list dd,
.spec-list .spec-list__v {
  margin: 0;
  color: var(--fg);
}

/* ---------- 功能卡片 ---------- */
.feature-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
}
.feature {
  background: linear-gradient(180deg, #ffffff, #fcfdfe);
  padding: 1.4rem;
  padding: clamp(1.4rem, 1rem + 1.6vw, 2.1rem);
  position: relative;
  transition: background-color var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out);
}
.feature::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-slow) var(--ease-out);
}
.feature:hover {
  background: linear-gradient(180deg, #f7f9fd, #f2f6fb);
}
.feature:hover::before {
  transform: scaleX(1);
}
.feature__index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--fg-mute);
}
.feature__icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  margin: 1.1rem 0 1.25rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--cyan);
  background: rgba(10, 124, 156, 0.06);
}
.feature__icon svg {
  width: 19px;
  height: 19px;
}
.feature h3 {
  font-size: var(--step-1);
  margin-bottom: 0.5rem;
}
.feature p {
  margin: 0;
  color: var(--fg-dim);
  font-size: var(--step--1);
  line-height: 1.75;
}

/* ============================================================
   实时搜索
   ============================================================ */
.search-section {
  background: linear-gradient(180deg, rgba(242, 246, 251, 0.8), transparent);
}
.search-layout {
  display: grid;
  gap: 1.5rem;
  gap: clamp(1.5rem, 1rem + 2.5vw, 3rem);
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  align-items: start;
}

.searchbox {
  position: relative;
  z-index: 5;
}
.searchbox__field {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1.05rem 1.15rem;
  background: var(--ink-800);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease-out),
    box-shadow var(--dur) var(--ease-out);
}
.searchbox__field:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--shadow-glow);
}
.searchbox__field svg.lens {
  width: 18px;
  height: 18px;
  color: var(--cyan);
  flex: none;
}
.searchbox input {
  flex: 1;
  min-width: 0;
  background: none;
  border: 0;
  outline: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.01em;
}
.searchbox input::placeholder {
  color: var(--fg-mute);
}
.searchbox__count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--fg-mute);
  flex: none;
}
.searchbox__clear {
  background: none;
  border: 0;
  color: var(--fg-mute);
  cursor: pointer;
  padding: 0.2rem;
  line-height: 0;
  display: none;
}
.searchbox__clear svg {
  width: 15px;
  height: 15px;
}
.searchbox__clear:hover {
  color: var(--danger);
}
.searchbox.has-value .searchbox__clear {
  display: block;
}

.results {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 6px);
  background: #ffffff;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: 0 30px 60px -25px rgba(15, 23, 42, 0.28);
  max-height: 340px;
  overflow-y: auto;
  overscroll-behavior: contain;
  display: none;
}
.results.is-open {
  display: block;
  animation: pop var(--dur) var(--ease-out);
}
@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.results__group {
  padding: 0.45rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
  border-bottom: 1px solid var(--line);
  background: rgba(243, 246, 251, 0.97);
  position: -webkit-sticky;
  position: sticky;
  top: 0;
}
.results li[role="option"] {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.68rem 0.95rem;
  cursor: pointer;
  border-bottom: 1px solid rgba(23, 43, 77, 0.07);
  font-size: 0.92rem;
  transition: background-color var(--dur-fast) linear;
}
.results li[role="option"]:last-child {
  border-bottom: 0;
}
.results li[role="option"]:hover,
.results li[role="option"].is-active {
  background: rgba(10, 124, 156, 0.1);
}
.results li[role="option"].is-active {
  box-shadow: inset 2px 0 0 var(--cyan);
}
.results mark {
  background: none;
  color: var(--cyan);
  font-weight: 600;
}
.results__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--fg-mute);
  flex: none;
}
.results__empty {
  padding: 1.15rem 0.95rem;
  color: var(--fg-mute);
  font-size: var(--step--1);
  font-family: var(--font-mono);
}
.search-help {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--fg-mute);
}
kbd {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: var(--radius);
  background: var(--ink-700);
  color: var(--fg);
}

/* 快捷入口 aside */
.quicklinks {
  padding: 0;
}
.quicklinks h3 {
  font-size: var(--step-1);
  padding: 1.15rem 1.25rem;
  margin: 0;
  border-bottom: 1px solid var(--line);
}
.quicklinks ul {
  display: grid;
}
.quicklinks a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.95rem 1.25rem;
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  transition: background-color var(--dur-fast) linear,
    padding-left var(--dur) var(--ease-out), color var(--dur-fast) linear;
}
.quicklinks li:last-child a {
  border-bottom: 0;
}
.quicklinks a:hover {
  background: rgba(10, 124, 156, 0.07);
  color: var(--cyan);
  padding-left: 1.6rem;
}
.quicklinks a span.arrow {
  margin-left: auto;
  transition: transform var(--dur) var(--ease-out);
}
.quicklinks a:hover span.arrow {
  transform: translateX(4px);
}
.quicklinks__note {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.72rem;
  color: var(--fg-mute);
  font-family: var(--font-mono);
  line-height: 1.7;
}

/* ---------- 接入方式 ---------- */
.steps {
  counter-reset: step;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}
.steps > li {
  counter-increment: step;
  background: #ffffff;
  padding: 1.5rem 1.1rem;
  padding: 1.5rem clamp(1.1rem, 0.8rem + 1.2vw, 1.6rem);
  position: relative;
}
.steps > li::before {
  content: "0" counter(step);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  display: block;
  margin-bottom: 0.85rem;
}
.steps h3 {
  font-size: var(--step-1);
  margin-bottom: 0.5rem;
}
.steps p {
  margin: 0;
  font-size: var(--step--1);
  color: var(--fg-dim);
}

.codeblock {
  margin-top: 1.75rem;
  margin-top: clamp(1.75rem, 1rem + 2.5vw, 2.75rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #f6f8fb;
}
.codeblock__bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: rgba(240, 244, 250, 0.95);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--fg-mute);
}
.codeblock__lang {
  color: var(--cyan);
}
.copy-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--fg-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.32rem 0.6rem;
  cursor: pointer;
  transition: color var(--dur-fast) linear, border-color var(--dur-fast) linear,
    background-color var(--dur-fast) linear;
}
.copy-btn svg {
  width: 13px;
  height: 13px;
}
.copy-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}
.copy-btn.is-done {
  color: var(--ok);
  border-color: rgba(18, 134, 76, 0.5);
  background: rgba(18, 134, 76, 0.08);
}
.codeblock pre {
  margin: 0;
  padding: 1.15rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.85;
  color: #1f2b3d;
}
.codeblock .t-comment {
  color: #6d7b91;
  font-style: italic;
}
.codeblock .t-tag {
  color: var(--cyan);
}
.codeblock .t-attr {
  color: var(--violet);
}
.codeblock .t-str {
  color: var(--amber);
}
.codeblock .t-key {
  color: #0369a1;
}

/* ---------- 友情链接 ---------- */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.friend-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  color: var(--fg-dim);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  transition: color var(--dur-fast) linear, border-color var(--dur-fast) linear,
    transform var(--dur-fast) var(--ease-out);
}
.friend-links a:hover {
  color: var(--cyan);
  border-color: rgba(10, 124, 156, 0.45);
  transform: translateY(-2px);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: #f7f9fc;
  padding-top: 2.5rem;
  padding-top: clamp(2.5rem, 1.5rem + 4vw, 4rem);
  padding-bottom: 2rem;
  margin-top: var(--pad-block);
}
.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1.4fr) repeat(auto-fit, minmax(140px, 1fr));
}
/* 页脚小标题使用 span 而非 h4，避免主内容未出现 h3 时标题层级跳级 */
.footer-col__title {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 0.9rem;
}
.footer-col a,
.footer-col li {
  display: block;
  font-size: var(--step--1);
  color: var(--fg-dim);
  text-decoration: none;
  padding: 0.22rem 0;
}
.footer-col a:hover {
  color: var(--cyan);
}
.footer-about {
  max-width: 34ch;
  font-size: var(--step--1);
  color: var(--fg-mute);
  line-height: 1.8;
}
.site-footer__bottom {
  margin-top: 2rem;
  margin-top: clamp(2rem, 1rem + 3vw, 3rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--fg-mute);
}

/* ============================================================
   内页：页头 banner
   ============================================================ */
.page-head {
  padding-top: 3.5rem;
  padding-top: clamp(3.5rem, 2rem + 6vw, 6rem);
  padding-bottom: 2rem;
  padding-bottom: clamp(2rem, 1rem + 3vw, 3rem);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.page-head::before {
  content: "";
  position: absolute;
  inset: auto 30% -60% -10%;
  background: radial-gradient(
    50% 50% at 40% 60%,
    rgba(10, 124, 156, 0.14),
    transparent 70%
  );
  filter: blur(24px);
}
.page-head > .shell {
  position: relative;
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 1.1rem;
}
.breadcrumb a {
  color: var(--fg-mute);
  text-decoration: none;
}
.breadcrumb a:hover {
  color: var(--cyan);
}
.breadcrumb span {
  color: var(--line-strong);
  margin-left: 0.5rem;
  margin-right: 0.5rem;
}
.page-head p {
  color: var(--fg-dim);
  font-size: var(--step-1);
  margin-bottom: 0;
}

/* 文档 TOC */
.doc-layout {
  display: grid;
  gap: 2rem;
  gap: clamp(2rem, 1rem + 4vw, 4rem);
  grid-template-columns: 220px minmax(0, 1fr);
  align-items: start;
}
.toc {
  position: -webkit-sticky;
  position: sticky;
  top: calc(var(--header-h) + 2rem);
  border-left: 1px solid var(--line);
  padding-left: 1.25rem;
}
.toc h2 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 0.9rem;
}
.toc a {
  display: block;
  padding: 0.3rem 0;
  font-size: var(--step--1);
  color: var(--fg-dim);
  text-decoration: none;
  transition: color var(--dur-fast) linear, transform var(--dur-fast) var(--ease-out);
}
.toc a:hover,
.toc a.is-active {
  color: var(--cyan);
  transform: translateX(3px);
}
.doc article + article {
  margin-top: 2.5rem;
  margin-top: clamp(2.5rem, 1.5rem + 4vw, 4rem);
  padding-top: 2rem;
  padding-top: clamp(2rem, 1rem + 3vw, 3rem);
  border-top: 1px solid var(--line);
}
.doc h2 {
  font-size: var(--step-2);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}
.doc h3 {
  font-size: var(--step-1);
  margin-top: 1.75em;
}
.doc p,
.doc li {
  color: var(--fg-dim);
}
.doc ol.numbered {
  list-style: decimal;
  padding-left: 1.3rem;
}
.doc ol.numbered li {
  padding: 0.2rem 0;
}
.doc ul.bullet {
  list-style: disc;
  padding-left: 1.3rem;
}
.doc ul.bullet li {
  padding: 0.15rem 0;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 1.25rem 0;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--step--1);
  min-width: 520px;
}
caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(240, 244, 250, 0.9);
}
th,
td {
  text-align: left;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
thead th {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  font-weight: 400;
  background: rgba(240, 244, 250, 0.85);
}
tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}
tbody tr:hover {
  background: rgba(10, 124, 156, 0.04);
}
td code,
th code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  color: var(--cyan);
}

.faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  margin-bottom: 0.6rem;
  overflow: hidden;
}
.faq summary {
  cursor: pointer;
  padding: 1rem 1.15rem;
  font-family: var(--font-display);
  font-weight: 500;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: color var(--dur-fast) linear, background-color var(--dur-fast) linear;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 1.1rem;
  line-height: 1;
  transition: transform var(--dur) var(--ease-out);
}
.faq details[open] summary::before {
  transform: rotate(45deg);
}
.faq summary:hover {
  color: var(--cyan);
  background: rgba(10, 124, 156, 0.05);
}
.faq details > div {
  padding: 0 1.15rem 1.15rem 2.6rem;
  color: var(--fg-dim);
  font-size: var(--step--1);
}

/* ---------- 表单 ---------- */
.form-shell {
  display: grid;
  gap: 2rem;
  gap: clamp(2rem, 1rem + 4vw, 4rem);
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  align-items: start;
}
.auth-card {
  padding: 1.5rem;
  padding: clamp(1.5rem, 1rem + 2vw, 2.5rem);
}
.tabs {
  display: flex;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.75rem;
}
.tabs button {
  flex: 1;
  padding: 0.75rem 1rem;
  background: #f2f5fa;
  border: 0;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  transition: color var(--dur-fast) linear, background-color var(--dur-fast) linear;
}
.tabs button:hover {
  color: var(--fg);
}
.tabs button[aria-selected="true"] {
  background: var(--cyan);
  color: #ffffff;
  font-weight: 600;
}

.field {
  margin-bottom: 1.15rem;
}
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 0.45rem;
}
.field input {
  width: 100%;
  padding: 0.85rem 0.95rem;
  background: var(--ink-800);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--dur-fast) linear,
    box-shadow var(--dur-fast) linear;
}
.field input::placeholder {
  color: #91a0b6;
}
.field input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(10, 124, 156, 0.14);
}
.field.has-error input {
  border-color: var(--danger);
}
.field__error {
  display: none;
  margin-top: 0.4rem;
  font-size: 0.74rem;
  color: var(--danger);
  font-family: var(--font-mono);
}
.field.has-error .field__error {
  display: block;
  animation: shake var(--dur) var(--ease-out);
}
@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-3px);
  }
  75% {
    transform: translateX(3px);
  }
}
.field-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.76rem;
  margin-bottom: 1.4rem;
}
.check {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--fg-dim);
  cursor: pointer;
}
.check input {
  appearance: none;
  width: 15px;
  height: 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--ink-800);
  cursor: pointer;
  display: grid;
  place-content: center;
}
.check input::after {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--cyan);
  transform: scale(0);
  transition: transform var(--dur-fast) var(--ease-out);
}
.check input:checked::after {
  transform: scale(1);
}
.form-status {
  margin-top: 1.15rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(163, 92, 0, 0.35);
  background: rgba(163, 92, 0, 0.08);
  color: var(--amber);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  display: none;
}
.form-status.is-shown {
  display: block;
  animation: pop var(--dur) var(--ease-out);
}

/* 关于页资料卡 */
.info-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
}
.info-grid > div {
  background: #ffffff;
  padding: 1.35rem 1.4rem;
}
.info-grid dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 0.5rem;
}
.info-grid dd {
  margin: 0;
  font-size: var(--step-0);
  color: var(--fg);
}
.timeline {
  border-left: 1px solid var(--line);
  padding-left: 1.5rem;
}
.timeline > li {
  position: relative;
  padding-bottom: 1.75rem;
}
.timeline > li::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 4px);
  top: 0.55rem;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(10, 124, 156, 0.14);
}
.timeline > li:last-child {
  padding-bottom: 0;
}
.timeline time {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  display: block;
  margin-bottom: 0.3rem;
}
.timeline h3 {
  font-size: var(--step-1);
  margin-bottom: 0.35rem;
}
.timeline p {
  margin: 0;
  color: var(--fg-dim);
  font-size: var(--step--1);
}

/* ---------- 滚动渐显 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}
.reveal[data-reveal-delay="80"] {
  transition-delay: 80ms;
}
.reveal[data-reveal-delay="160"] {
  transition-delay: 160ms;
}
.reveal[data-reveal-delay="240"] {
  transition-delay: 240ms;
}
.reveal[data-reveal-delay="320"] {
  transition-delay: 320ms;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .hero__grid,
  .split,
  .search-layout,
  .form-shell {
    grid-template-columns: minmax(0, 1fr);
  }
  .doc-layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .toc {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 1.25rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1.5rem;
  }
  .toc h2 {
    width: 100%;
    margin-bottom: 0.5rem;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 62px;
  }
  .nav-toggle {
    display: grid;
  }
  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    margin-left: 0;
    background: rgba(255, 255, 255, 0.99);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem 0 1.25rem;
    transform: translateY(-102%);
    visibility: hidden;
    transition: transform var(--dur) var(--ease-out),
      visibility var(--dur) var(--ease-out);
    z-index: 90;
  }
  .site-nav.is-open {
    transform: none;
    visibility: visible;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-left: 1.1rem;
    padding-left: clamp(1.1rem, 0.5rem + 3vw, 2.5rem);
    padding-right: 1.1rem;
    padding-right: clamp(1.1rem, 0.5rem + 3vw, 2.5rem);
  }
  .site-nav__link {
    display: block;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
    font-size: 0.9rem;
  }
  .site-nav__link.is-active::after {
    display: none;
  }
  .nav-actions .btn:not(.nav-toggle) {
    display: none;
  }
  .notice {
    grid-template-columns: auto minmax(0, 1fr);
  }
  .notice > .btn {
    grid-column: 1 / -1;
    justify-self: start;
  }
  .footer-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
}

@media (max-width: 520px) {
  .hero__meta {
    gap: 0.35rem 1rem;
  }
  .spec-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.25rem;
  }
  .results li[role="option"] {
    flex-wrap: wrap;
  }
  .results__hint {
    margin-left: 0;
  }
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 打印 ---------- */
@media print {
  body {
    background: #fff;
    color: #000;
  }
  .site-header,
  .nav-toggle,
  .copy-btn,
  .searchbox,
  .results {
    display: none !important;
  }
}

/* Chrome 51 等支持 var() 但不支持 clamp() 的浏览器：在此补回流体字号/间距 */
@supports (font-size: clamp(1rem, 1vw, 2rem)) {
  :root {
    --step--1: clamp(0.78rem, 0.76rem + 0.1vw, 0.85rem);
    --step-0: clamp(0.95rem, 0.92rem + 0.15vw, 1.03rem);
    --step-1: clamp(1.12rem, 1.05rem + 0.35vw, 1.32rem);
    --step-2: clamp(1.4rem, 1.25rem + 0.7vw, 1.85rem);
    --step-3: clamp(1.8rem, 1.5rem + 1.4vw, 2.6rem);
    --step-4: clamp(2.3rem, 1.7rem + 2.8vw, 3.9rem);
    --gap: clamp(1rem, 0.6rem + 1.6vw, 1.75rem);
    --pad-block: clamp(3.5rem, 2rem + 6vw, 7.5rem);
  }
}